214 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
M. rivicola in timber twelve miles from the sea; in Borneo (fresh water). 
(Tryon. S. S. Conch.) 
Type. Pholas striata Linnaeus. 
Distribution. World wide. 
Range in time. Cretaceous, Pleistocene. 
Martesia xylophaga Valenciennes, 1846. 
Voy. Venus, Atlas, pi. 24, fig. 2. 
Valenciennes named and figured this species, but did not describe it. 
This may prove on further study to be the same as M. striata Sowerby. 
No material is available upon which to base a description. 
Type locality, somewhere on the Pacific Coast. 
Range. San Francisco, California, to Panama. 
Martesia intercalata Carpenter, 1855. 
Mazatlan Cat., No. 19:13. 
M. t. parva, subglobosa, in duas partes divisa; parte anteriore tenuissime 
concertice striata, radiis longitudinalibus subobsoletis vix undata; in 
juniore maxime hiante, margine solido; in adulta secretione semi-cornea 
clausa: parte postica sublsevi, epidermide copiose induta, margine rotun- 
dato; umbonibus testa reflexa adhserente caelatis; clypeo pyriforme, parvo, 
solido, inter secretiones valvarum intercalate; partibus ventrali et dorsali 
laminis semi-corenis, brevibus, a calyce repulsis; calyce piano, brevi, 
simplici, extante. Long., .34; lat., .35; alt., .33. (Carpenter.) 
Type in British Museum. Type locality, Mazatlan, in Spondylus. 
Range. Farallon Islands to Mazatlan, Mexico. 
Genus NAVEA Gray, 1851. 
Shell sub-globose, closed behind; anterior gape very large, not closed 
up by age; edge reflected, crenulated; valves with a sunken sub-central rib; 
anterior dorsal edge reflected and closely appressed to the outer surface 
of the valve; dorsal muscles covered with a coriaceous periostracum, and 
with a small, transverse posterior valve placed behind the umbos; internal 
process simple, elongate, arched. 
Type. Navea subglobosa Gray. 
Distribution. California. 
Navea subglobosa Gray, 1851. 
Ann. Mag. Nat. Hist. (2), 8:385. Chenu, Man., 2:6, figs. 28, 29. 
Shell sub-globose, solid, truncated in front; anterior portion radiately 
ribbed and with a reflected undulated edge, hinder portion regularly, con¬ 
centrically grooved. (Gray.) 
Type in Cabinet Gray. Type locality, California in a shell. 
Range. Lobitas to Monterey, California. 
